268 



THE YEAR-BOOK OF AGRICULTURE. 



tared : but although the sap of live oak and white oak is less durable than the heart, it is 

 generally 1 with the heart and aa merchantable timber. 



The lasting property of live oak consiste chiefly in its being devoid of that acid juice which 

 ■white oak contains. But this is not all: the whole of the capillary tabes Beem to he com- 

 pletely ooated and filled with a greasy, glutinous Bubstance that is not found in the sap, 

 which is doubtless the reason why the Bap is 1 1 > > t rendered equally durable. This Bubataaot 

 be brought out for analysation by Bteaming: it takes steam quite as well, it' not better, 

 than yellow pine. The monthly tallies of specific gravity of the green tree furnishing u^. as 

 they do, a basis of (doubtless) the most reliable series of experiments ever undertaken in 

 this or any other country, will, we think, be examined with interest by mechanics, and par- 

 ticularly those whose business it is to use the three kinds of timber of which they take cog- 

 nizance. In addition to the monthly tables, Mr. Jarvis has furnished us with the mean 



. ific gravity as made up of twelve months, and carried the whole out into pounds and 

 ounces avoirdupois. 



GREEN TKEE. 



Specific Gravity of Timber fresh from the Forest, none of which was felled more than ten daya 



before the Specific Gravity was obtained. 



BOOBD LITE OAK. 

 Month felled. Specific 



September 15 1111 



October 15 117.: 



November 15 1-182 



December 15 1-186 = 



January 15 1*194 = 



nary 15 1-1 "•' 



March 15 1*187 



April 15 1*193 = 



May I. - - 1*182 - 



June 15 1*164- 



July 15 II is 



August 12 1176 = 



bqcahe live oak. 

 Month fell Specific 



mber 15 1*242 = 



<>■•(., i„. r 16 1.273 



Mil. .a- 15 1*274 



l.. 1*283 



January 16 I 



L6 1-252 = 



March L6 1*261 



April 15 L-244 



May L5 1 



June 16 1*367 



July 15 1*239 



Augusl 11' I 



ROCND WUITE OAK. 



Month felled. 



Specific 



September 16 -950 = 



October 15 -097 = 



November 15 -996 = 



December 15 1-018 = 



January 16 1-015 = 



February 16 1-014 = 



.March 15 1-OTOe 



April 15 1*013. 



May 15 1-021 = 



June 15 1-005 = 



July 15 1-089 = 



August 15 1054 = 



8QCARE WHITE OAK. 



Month felled. Specific 



September 15 1-037 = 



Ootober 16 1-069 = 



November 15 1-058 = 



mber 16 1-083 = 



January 15 1*088 



February 15 1-O60 



March 15 1*044 



April 1. 1*071 



May 15 1-102 = 



June l.'. 1*1 



July 15 1-128 



August 15 1 



gravity. 

 lh». or. 



= 59 6 

 = 62 5 

 = 62 4 

 = 63 10 

 = 63 7 

 = 63 6 

 = 67 7 

 = 63 5 

 = 63 13 

 = 62 13 

 = 68 1 

 = 65 14 



gravity, 

 lbs. oz. 



= 06 13 



M 

 = 67 



ROCN-D YELLOW PINT. 



Month felled. 



Be gravity. 

 lbs. oi. 



51 12 

 17 12 



September 15 -828 



October 15 -764 



November 15 -777 = 48 9 



December 15 -765 = 47 13 



January 15 '823— =51 7 



February 15 •78(1 = 49 5 



March 15 "782 -—48 14 



April 15 -795 = 49 11 



May 15 -744 = 46 S 



June 15 -702 = 49 8 



July 15 -751=46 15 



August 15 -772 = 48 4 



2 

 11 

 66 12 

 06 L0 



65 4 

 86 15 



6 s 1 I 



:64 

 :70 



67 10 



8QCARE TELLOW PI.VE. 



Month felli-d. Specific gravity. 



lbs. oi. 



September 15 -665 = 41 9 



October 15 -662 = 41 6 



November 15 -65:1 = 4(1 13 



December 15 -689 = 39 15 



January 15 -625 = 39 1 



February 15 -673 = 42 1 



March L6 -681 86 5 



April 15 -683=42 11 



May 15 '683-- 86 7 



Juno 15 -595 = 37 3 



July 15 -655=40 15 



August 15 -639 = 39 15 



SPECIFIC ORAVITT FOR one n \H. 



Dm. oa. 



tare pieces of live oak (fractions off) 1*259 => 78 11 



Round 

 Square 

 Round 

 Square 

 Round 



" in baric 2*191 71 7 



white »:ik l*06fl >66 II 



" in bark 1*020 63 13 



yellow pine '687 89 18 



" in bark -7M isi.i 



Too Many Shade-trees Injurious. 



HOW. Mil DlOXDiaOK, an extensive farmer of Steuben county, New York, has recently ad- 

 vance. 1 the idea a Rural New Yorker) that do tanner oaa <ijT<>rri to keep ghade- trc ei 

 ■rhere than by the wayside, and hardly there. Mr. D. carries on a number of farms, 



D which, by % mel labor, he ha- - i v < ■ ■ I a larjjv number of the finest -ha-le-trccs; 



v cutting then, down, for he farm- for profit, and cannot let them stand. The 

 injury they do to n crop in taking up the moisture for some distance around, Bad leaving the 



